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my networked computers cannot see the internet

Posted on 2004-09-27
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Last Modified: 2010-04-10
I have 5 computers networked, I gave them IP addresses of 10.10.0.1-5  I have the subnet mask setup as 255's and the gateway I have set to the IP address given to me by the provider.  I used to have the gateway set to 10.10.0.10 but they could not "see" the internet so I switched it over to the current one and it worked fine and dandy.  Something happened to the office and I don't know if it was a power shortage or sabtouge by competitors.  I was called back because the computers could either "see" a shared program or "see" the internet but not both.  When I went into network properties the bullet had been switched to "Assign an IP address automatically" when I switched back the computers to manual that solved the shared program and then all the computers were able to share info.  But after I tried getting a computer 4 on the internet by "connections wizard" something happened and even my server could not get on the internet.  They are all XP by the way.  please help
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Question by:markofenstein
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by:Mazaraat
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Do you have a router or firewall appliance in place that issues IP addresses?

Also is your server the gateway to the internet?  By that I mean does you internet connect directly to the server and all PC's go through it?

Here is how the networking should look if the server is the gateway:

Server (network card settings for local network)
IP Address:  10.10.10.1
Subnet:        255.255.255.0
Gateway:     blank

Clients
IP Address:  10.10.10.2 (change per PC)
Subnet:        255.255.255.0
Gateway:     10.10.10.1

Now if you have a router or firewall/gateway device you set everyones IP address to its local side, for example:
(I would check the device to see if it supports DHCP, it might be on, and causing trouble for your static addressing)
A router/firewall device usually has at least 1 WAN connection which goes to your internet, and at least 1 LAN connection

If the inside address looks like this:
10.10.10.254
255.255.255.0

then your gateway for all the PC's + server will be 10.10.10.254, usually Router/firewall devices default to a 192.168.x.x type of address though. I have even seen 172.16.x.x on the 2wire homeportal routers.

Hope that helps!
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by:jjk16
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"when testing internet connectivity its best to ping from the command prompt"

start-->run-->command
ping 216.239.39.99    (thats googles ip)

if you can ping but cant open the page in a browser then you have winsock problems

" have the subnet mask setup as 255's"
all 255s are not allowed i.e (255.255.255.255)its reserved for broadcasts

if i remember right  a class b network the sub should be something like this

255.255.0.0

class c  
255.255.255.0

kind of overkill for 5 computers to have an entire class b address
(even for nat)

i would use something like

192.168.7.xxx(im partial to the the 192.168.x.x range)


"Something happened to the office and I don't know if it was a power shortage or sabtouge by competitors"

I generally find if competitors are smart enough to mess up your network then they would have done alot worse

sad that the world is as it is that people have to worry about competitors or other malevolent people trying to ruin one's livelyhood.

they should swindle the money out of their own customers...

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by:markofenstein
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I have gone back and now 2 of the computers are "seeing" the internet.  If I switch those other comps. to "obtain an IP address automatically" they start seeing the internet but not the other computers.  The server is one of the comp. not "seeing" the internet.  
how do I check to see if the device supports DHCP.  
I have a 6connector gear router 8 port.,  6 wires connected to it: 5 comp. one speed stream DSLmodem.  There are 2 rows of lights one labeled LNK/ACT which are all lit up and 100M which are all lit up except for the wire to the server and the wire to the modem.  I don't know what that 100M means.  I just find it weird that I have all my computers set up the same (and exactly like they were a few weeks ago and functioning) and only a few see the internet and other computers.
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by:Mazaraat
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>If I switch those other comps. to "obtain an IP address automatically" they start seeing the internet but not the >other computers

This is because they most likely have different IP addresses right now.To verify you can do this on each computer:
Start Button->Run->type CMD.EXE click ok->type ipconfig
Verify that the IP addresses are similar and the last number different, also check that they all have the same gateway.

>If I switch those other comps. to "obtain an IP address automatically" they start seeing the internet but not the >other computers
>how do I check to see if the device supports DHCP?

If you set the network properties to obtain automatically AND the computer gets to the internet, then your router is probably DHCP enabled and handing out IP addresses.  I would set all you computers to obtain an IP address automatically.

> I don't know what that 100M means.

Thats the speed of that port






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by:markofenstein
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Every IP address is set up right they have the first 3 numbers the same and the last different.   The subnet mask is 255.255.255.0 on all of them they all have the gateway to the router the same.  I do not want to go with obtain IP address auto b/c then my medisoft program gives me trouble with networking.  I just prefer to manually assign IP addresses, it's easier to work with.  
I have even checked the cables and that's not the problem.  
I can't ping any internet address from the non internet comps. but I can ping the all the comps. on my network from every computer.
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by:Mazaraat
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Very interesting-

Just to verify, if you Start Button->Run->type CMD.EXE click ok->type ipconfig /all

does it show the gateway on all computers as the same?  Can you ping the gateway from all computers?

Also verify your routers config by going to http://ipaddress of your gateway check the lan config/settings it might be that your using an address outside what it is configured for.....
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by:markofenstein
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I figured the problem was sabatouge.  So I bought a new and better router and configured it for me, and not the old network guy the clinic had.  Once I got the new ip address for the router everything works.  thank you I figured the problem
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